The @theia/markers adds support for file markers (diagnostic markers (errors, warnings, infos, hint)) for a given file.
The extension contributes, the following:
problems view: a dedicated view to viewing diagnostic markers contributed by language-servers, linters, task problem matchers for the workspacemarker decoration: ability to decorate different components of the application based on markers (ex: file explorer)"Theia" is a trademark of the Eclipse Foundation https://www.eclipse.org/theia